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Fe 3+ + SCN – FeSCN 2+ 3.KSCN = colourless, Fe(NO 3 ) 3 = colourless mixed = brown, red, rusty, etc., FeSCN 2+ provides the colour 10. 2- Darker brown,

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Presentation on theme: "Fe 3+ + SCN – FeSCN 2+ 3.KSCN = colourless, Fe(NO 3 ) 3 = colourless mixed = brown, red, rusty, etc., FeSCN 2+ provides the colour 10. 2- Darker brown,"— Presentation transcript:

1 Fe 3+ + SCN – FeSCN 2+ 3.KSCN = colourless, Fe(NO 3 ) 3 = colourless mixed = brown, red, rusty, etc., FeSCN 2+ provides the colour Darker brown, (more SCN – ) shift right (toward FeSCN 2+ ) 3- Darker brown, (more Fe 3+ ) shift right (toward FeSCN 2+ ) 4- Lighter brown, (less Fe 3+ ) shift left (away from FeSCN 2+ ) 11. None (they are all the same), Only temperature changes Kc

2 Equilibrium Lab 12Fe 3+ SCN – FeSCN 2+ SCN – = None* Fe 3+ = Na 2 HPO 4 ** Fe 3+ = Fe(NO 3 ) 3 *** *(With SCN –, only a SCN – will reestablish equilibrium. None of these chemicals work. (addition of Na 2 HPO 4 can decrease FeSCN 2+ to its original [ ], but not the others). **Fe 3+ has been increased. The only way to reestablish equilibrium is to decrease Fe 3+. ***Fe 3+ has decreased. The only way to reestablish equilibrium is to increase Fe 3+.

3 The Haber process A second application of Le chateliers principle (film = 10 min) For more lessons, visit


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